Lochinvar & A.O. Smith 100111256 Flame Control Board

Thermostatic expansion valves are an integral part of your refrigeration unit. They are responsible for ensuring the right dosage of refrigerant is entering the cooling coil to ensure maximum efficiency in the air conditioning of the system.    These special expansion valves come with a temperature sensor that is mounted at the end of the evaporator coil. They incorporate signals from this sensor to maintain the required temperature of the HVAC system. The thermostatic expansion valve works like a precision device that can regulate the measurements of the liquid refrigerant that flows into the evaporator of your system. This regulation in the flow of the refrigerant is essential to prevent the reverse flow of the refrigerant into the compressor of your system.    Through this mechanism, the thermostatic expansion valve successfully separates the high and low pressure sides of the refrigeration/air conditioning system. The liquid refrigerant enters the expansion ...

Keep the control board clean, dry, and free from dust buildup to prevent electrical interference. Inspect wiring harnesses for loose or burnt connections and ensure secure grounding. Periodically check for corrosion on terminals and check proper voltage supply during servicing.

• Ignition failure or no flame signal.
• System lockout or repeated reset condition.
• Intermittent burner operation.
• Relay or circuit failure on board.
• Damaged wiring or connector burn marks.
• Unstable flame sensing response.